Объяснение:
c²=|c|²=2²=4
d²=|d|²=(√3)²=3
c•d=|c|•|d|•cos30°=2•√3•(√3/2)=3
(2с+d)•(c-3d)=2c²-6cd+cd-3d²=
=2c²-5cd-3d²=2•4-5•3-3•3=8-15-9= -16
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Объяснение:
c²=|c|²=2²=4
d²=|d|²=(√3)²=3
c•d=|c|•|d|•cos30°=2•√3•(√3/2)=3
(2с+d)•(c-3d)=2c²-6cd+cd-3d²=
=2c²-5cd-3d²=2•4-5•3-3•3=8-15-9= -16